Discharge mechanism for shears.



No. 880811. A PATBNTED MAR. 3, 1908v A. R. MGAR'IHUR. DISCHARGE MECHANISM FOR SHEARS. 'APPLIGATION FILED JULY 1e. 1907.

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APPLICATION FILED JULY 16. 1907.

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uNiTnn sTaTns PATENT oFFIoE.

ARTHUR R. MCARTHUR, OF ELWOOD, INDIANA, ASSIGNOR TO AMERICAN SHEET da TIN PLATE COMPANY, OF PITTSBURG, PENNSYLVANIA, A CORPORATION OF NEW JERSEY.

DISCHARGE MECHANISM'FOR SHEARS.

Specification of Letters Patent.

Patented March 3, 1908.

To all 'whom 'it may concern:

Be it known that I, ARTHUR R. MoAn- THUR, of Elwood, Madison county, Indiana, have invented a new and useful Discharge Mechanism for Shears, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming part of this specification, in which- Figure 1 is a top plan view of a table shear provided with my improved discharge device Fig. 2 is a front elevation of the same and Figs. 3 and 4 are side elevations on opposite sides of the same.

My invention relates to squaring-up shears for shearing sheet metal and similar articles, and is designed to provide an automatic discharge or throw-out device for the sheet after the shearing operation.

In the drawings, 2 and 3 represent front and rear standards or castings connected by side frame pieces 4 and 5. On these are supported the shear table 6 having stationary shear blades 7 and 8 at its sides, cooperating with the movable shear blades 9, 9. These shear blades are secured to cross-heads 10 moving in suitable guideways, and connected by adjustable links 11 to levers 12, pivoted at their inner ends to an attachment 13 give the shaft one revolution and then stop.

19 is a foot treadle connected through links 20 with rock arms 21 on the shaft extending from the pin clutch to throw it into engagement. The foot lever and rock shaft are returned by spring 22.

The table is provided near its front end with slots through which project the throwout lugs or projections 23. These lugs are secured by downwardly projecting stems to tubular guides 24 which slide on stationary shafts 25 (preferably the cold-roll shaft) and extend from the front to the rear of the machine. Each tubular slide is secured to a cross shaft 26, at the central portion of which is mounted a collar 27 forming part of the link 28 pivoted to a bent arm 29. This bent arm extends from the central portion of the machine over to one side and thence down to a shaft 30 to which it is loosely connected. To the lower pivoted portion of this bent arm is secured a cam finger 31, which turns on in or shaft 30 and is engaged by a cam 32 wliich is rigidly secured to the operating shaft 16. The throw-.out mechanism is returned to normal position by spring 33 attached to the lower end of the bent arm 29a; and the force of the return stroke is taken up by the spring buffers 34, at each side of the machine.

In operating the machine, the attendant standing at the front of the machine draws a sheet forwardly on the table until it strikes the gage stops. IIe then pushes down the foot pedal and thereby engages the pin clutch, the shear blades then descend and shear both ends of the sheet, and immediately after shearing the cam 32 guides the cam finger 31 and moves both of the lugs or projections 23 forwardly within the table slots, giving them a quick forward movement. This rapid forward movement gives the sheet an impetus which carries it completely ofl the table. The throw-out mechanism is then returned by the spring action and the movement of the shears stops after they are lifted again during the one revolution of the shafts. The operations are then repeated.

The table is preferably provided with fixed stops 35 in the rear of the movable stops or throw-outs, so that the operator will have fixed stops against which he will draw each of the sheets, the throw-outs then moving to a position in front of them as they kick the sheets out of the machine.

The advantages of my invention result from the use of the throw-out device as distinguished from the old swinging arm device for removing the sheet. The throwing-out operation is rapid, thus increasing the output while the mechanism is simple and not liable to get out of order. Many variations may be made in the form and arrangement of the general shear mechanism and the particular arrangement of the throw-out without departing from my invention.

I claim 1. A double resquaring shear having a throw-out device arranged to engage one edge of the sheet while in shearing position,

and connections arranged to operate said' throw-out to move the sheet from its shearing position; substantially as described.

2.` A double resquaring shear having a movable throw-out device provided with projections extending above the top of the table and arranged to engage an edge of the sheet other than the edges being squared up, and connections arranged to give a quick motion thereto to remove the sheet from its shearing position; substantially as described.

3. A double resquaring shear having a table provided with slots, throw-out projections extending up through the slots and movable along them, said projections being arranged to engage the sheet while in shearing position, and connections between the throwout mechanism and the moving parts of the machine, arranged to give it a quick back and forth movement after the shearing operation; substantially as described.

4. A double resquaring shear having side shearing apparatus, a longitudinally moving slide with a projection arranged to engage another edge of the sheet than those being sheared while in shearing position, and con` nections arranged to give the slide a quick movement after the shearing operation on the other ed es; substantially as described.

5. A doub e resquaring shear having side shearing apparatus, a longitudinally moving slide with a projection arranged to engage another edge of the sheet than those being sheared while in shearing position, connections arranged to give the slide a quick movement after the shearing operation on the Yother edges, and a spring connection arranged to return the throw-out substantially as described.

' 6. A double resquaring shear having fixed stops against which the sheet is drawn to shearing position, shearing devices arranged to engage two of the other edges of the sheet, and a throw-out arranged to engage the edge of the sheet against the fixed stops, while in shearing position; substantially as described.

ln testimony whereof I have hereunto set my hand.

A. R. MCARTHUR.A

` Witnesses: C, A. JAoKsoN, G. M. HARRY. i 

